#define XLOG_REG_TYPE_ICREATE 20
#define XLOG_REG_TYPE_RUI_FORMAT 21
#define XLOG_REG_TYPE_RUD_FORMAT 22
-#define XLOG_REG_TYPE_MAX 22
+#define XLOG_REG_TYPE_CUI_FORMAT 23
+#define XLOG_REG_TYPE_CUD_FORMAT 24
+#define XLOG_REG_TYPE_MAX 24
/*
* Flags to log operation header
#define XFS_LI_ICREATE 0x123f
#define XFS_LI_RUI 0x1240 /* rmap update intent */
#define XFS_LI_RUD 0x1241
+#define XFS_LI_CUI 0x1242 /* refcount update intent */
+#define XFS_LI_CUD 0x1243
#define XFS_LI_TYPE_DESC \
{ XFS_LI_EFI, "XFS_LI_EFI" }, \
{ XFS_LI_QUOTAOFF, "XFS_LI_QUOTAOFF" }, \
{ XFS_LI_ICREATE, "XFS_LI_ICREATE" }, \
{ XFS_LI_RUI, "XFS_LI_RUI" }, \
- { XFS_LI_RUD, "XFS_LI_RUD" }
+ { XFS_LI_RUD, "XFS_LI_RUD" }, \
+ { XFS_LI_CUI, "XFS_LI_CUI" }, \
+ { XFS_LI_CUD, "XFS_LI_CUD" }
/*
* Inode Log Item Format definitions.
};
/*
+ * CUI/CUD (refcount update) log format definitions
+ */
+struct xfs_phys_extent {
+ __uint64_t pe_startblock;
+ __uint32_t pe_len;
+ __uint32_t pe_flags;
+};
+
+/* refcount pe_flags: upper bits are flags, lower byte is type code */
+/* Type codes are taken directly from enum xfs_refcount_intent_type. */
+#define XFS_REFCOUNT_EXTENT_TYPE_MASK 0xFF
+
+#define XFS_REFCOUNT_EXTENT_FLAGS (XFS_REFCOUNT_EXTENT_TYPE_MASK)
+
+/*
+ * This is the structure used to lay out a cui log item in the
+ * log. The cui_extents field is a variable size array whose
+ * size is given by cui_nextents.
+ */
+struct xfs_cui_log_format {
+ __uint16_t cui_type; /* cui log item type */
+ __uint16_t cui_size; /* size of this item */
+ __uint32_t cui_nextents; /* # extents to free */
+ __uint64_t cui_id; /* cui identifier */
+ struct xfs_phys_extent cui_extents[]; /* array of extents */
+};
+
+static inline size_t
+xfs_cui_log_format_sizeof(
+ unsigned int nr)
+{
+ return sizeof(struct xfs_cui_log_format) +
+ nr * sizeof(struct xfs_phys_extent);
+}
+
+/*
+ * This is the structure used to lay out a cud log item in the
+ * log. The cud_extents array is a variable size array whose
+ * size is given by cud_nextents;
+ */
+struct xfs_cud_log_format {
+ __uint16_t cud_type; /* cud log item type */
+ __uint16_t cud_size; /* size of this item */
+ __uint32_t __pad;
+ __uint64_t cud_cui_id; /* id of corresponding cui */
+};
+
+/*
* Dquot Log format definitions.
*
* The first two fields must be the type and size fitting into
--- /dev/null
+/*
+ * Copyright (C) 2016 Oracle. All Rights Reserved.
+ *
+ * Author: Darrick J. Wong <darrick.wong@oracle.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_format.h"
+#include "xfs_log_format.h"
+#include "xfs_trans_resv.h"
+#include "xfs_mount.h"
+#include "xfs_trans.h"
+#include "xfs_trans_priv.h"
+#include "xfs_buf_item.h"
+#include "xfs_refcount_item.h"
+#include "xfs_log.h"
+
+
+kmem_zone_t *xfs_cui_zone;
+kmem_zone_t *xfs_cud_zone;
+
+static inline struct xfs_cui_log_item *CUI_ITEM(struct xfs_log_item *lip)
+{
+ return container_of(lip, struct xfs_cui_log_item, cui_item);
+}
+
+void
+xfs_cui_item_free(
+ struct xfs_cui_log_item *cuip)
+{
+ if (cuip->cui_format.cui_nextents > XFS_CUI_MAX_FAST_EXTENTS)
+ kmem_free(cuip);
+ else
+ kmem_zone_free(xfs_cui_zone, cuip);
+}
+
+STATIC void
+xfs_cui_item_size(
+ struct xfs_log_item *lip,
+ int *nvecs,
+ int *nbytes)
+{
+ struct xfs_cui_log_item *cuip = CUI_ITEM(lip);
+
+ *nvecs += 1;
+ *nbytes += xfs_cui_log_format_sizeof(cuip->cui_format.cui_nextents);
+}
+
+/*
+ * This is called to fill in the vector of log iovecs for the
+ * given cui log item. We use only 1 iovec, and we point that
+ * at the cui_log_format structure embedded in the cui item.
+ * It is at this point that we assert that all of the extent
+ * slots in the cui item have been filled.
+ */
+STATIC void
+xfs_cui_item_format(
+ struct xfs_log_item *lip,
+ struct xfs_log_vec *lv)
+{
+ struct xfs_cui_log_item *cuip = CUI_ITEM(lip);
+ struct xfs_log_iovec *vecp = NULL;
+
+ ASSERT(atomic_read(&cuip->cui_next_extent) ==
+ cuip->cui_format.cui_nextents);
+
+ cuip->cui_format.cui_type = XFS_LI_CUI;
+ cuip->cui_format.cui_size = 1;
+
+ xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_CUI_FORMAT, &cuip->cui_format,
+ xfs_cui_log_format_sizeof(cuip->cui_format.cui_nextents));
+}
+
+/*
+ * Pinning has no meaning for an cui item, so just return.
+ */
+STATIC void
+xfs_cui_item_pin(
+ struct xfs_log_item *lip)
+{
+}
+
+/*
+ * The unpin operation is the last place an CUI is manipulated in the log. It is
+ * either inserted in the AIL or aborted in the event of a log I/O error. In
+ * either case, the CUI transaction has been successfully committed to make it
+ * this far. Therefore, we expect whoever committed the CUI to either construct
+ * and commit the CUD or drop the CUD's reference in the event of error. Simply
+ * drop the log's CUI reference now that the log is done with it.
+ */
+STATIC void
+xfs_cui_item_unpin(
+ struct xfs_log_item *lip,
+ int remove)
+{
+ struct xfs_cui_log_item *cuip = CUI_ITEM(lip);
+
+ xfs_cui_release(cuip);
+}
+
+/*
+ * CUI items have no locking or pushing. However, since CUIs are pulled from
+ * the AIL when their corresponding CUDs are committed to disk, their situation
+ * is very similar to being pinned. Return XFS_ITEM_PINNED so that the caller
+ * will eventually flush the log. This should help in getting the CUI out of
+ * the AIL.
+ */
+STATIC uint
+xfs_cui_item_push(
+ struct xfs_log_item *lip,
+ struct list_head *buffer_list)
+{
+ return XFS_ITEM_PINNED;
+}
+
+/*
+ * The CUI has been either committed or aborted if the transaction has been
+ * cancelled. If the transaction was cancelled, an CUD isn't going to be
+ * constructed and thus we free the CUI here directly.
+ */
+STATIC void
+xfs_cui_item_unlock(
+ struct xfs_log_item *lip)
+{
+ if (lip->li_flags & XFS_LI_ABORTED)
+ xfs_cui_item_free(CUI_ITEM(lip));
+}
+
+/*
+ * The CUI is logged only once and cannot be moved in the log, so simply return
+ * the lsn at which it's been logged.
+ */
+STATIC xfs_lsn_t
+xfs_cui_item_committed(
+ struct xfs_log_item *lip,
+ xfs_lsn_t lsn)
+{
+ return lsn;
+}
+
+/*
+ * The CUI dependency tracking op doesn't do squat. It can't because
+ * it doesn't know where the free extent is coming from. The dependency
+ * tracking has to be handled by the "enclosing" metadata object. For
+ * example, for inodes, the inode is locked throughout the extent freeing
+ * so the dependency should be recorded there.
+ */
+STATIC void
+xfs_cui_item_committing(
+ struct xfs_log_item *lip,
+ xfs_lsn_t lsn)
+{
+}
+
+/*
+ * This is the ops vector shared by all cui log items.
+ */
+static const struct xfs_item_ops xfs_cui_item_ops = {
+ .iop_size = xfs_cui_item_size,
+ .iop_format = xfs_cui_item_format,
+ .iop_pin = xfs_cui_item_pin,
+ .iop_unpin = xfs_cui_item_unpin,
+ .iop_unlock = xfs_cui_item_unlock,
+ .iop_committed = xfs_cui_item_committed,
+ .iop_push = xfs_cui_item_push,
+ .iop_committing = xfs_cui_item_committing,
+};
+
+/*
+ * Allocate and initialize an cui item with the given number of extents.
+ */
+struct xfs_cui_log_item *
+xfs_cui_init(
+ struct xfs_mount *mp,
+ uint nextents)
+
+{
+ struct xfs_cui_log_item *cuip;
+
+ ASSERT(nextents > 0);
+ if (nextents > XFS_CUI_MAX_FAST_EXTENTS)
+ cuip = kmem_zalloc(xfs_cui_log_item_sizeof(nextents),
+ KM_SLEEP);
+ else
+ cuip = kmem_zone_zalloc(xfs_cui_zone, KM_SLEEP);
+
+ xfs_log_item_init(mp, &cuip->cui_item, XFS_LI_CUI, &xfs_cui_item_ops);
+ cuip->cui_format.cui_nextents = nextents;
+ cuip->cui_format.cui_id = (uintptr_t)(void *)cuip;
+ atomic_set(&cuip->cui_next_extent, 0);
+ atomic_set(&cuip->cui_refcount, 2);
+
+ return cuip;
+}
+
+/*
+ * Freeing the CUI requires that we remove it from the AIL if it has already
+ * been placed there. However, the CUI may not yet have been placed in the AIL
+ * when called by xfs_cui_release() from CUD processing due to the ordering of
+ * committed vs unpin operations in bulk insert operations. Hence the reference
+ * count to ensure only the last caller frees the CUI.
+ */
+void
+xfs_cui_release(
+ struct xfs_cui_log_item *cuip)
+{
+ if (atomic_dec_and_test(&cuip->cui_refcount)) {
+ xfs_trans_ail_remove(&cuip->cui_item, SHUTDOWN_LOG_IO_ERROR);
+ xfs_cui_item_free(cuip);
+ }
+}
+
+static inline struct xfs_cud_log_item *CUD_ITEM(struct xfs_log_item *lip)
+{
+ return container_of(lip, struct xfs_cud_log_item, cud_item);
+}
+
+STATIC void
+xfs_cud_item_size(
+ struct xfs_log_item *lip,
+ int *nvecs,
+ int *nbytes)
+{
+ *nvecs += 1;
+ *nbytes += sizeof(struct xfs_cud_log_format);
+}
+
+/*
+ * This is called to fill in the vector of log iovecs for the
+ * given cud log item. We use only 1 iovec, and we point that
+ * at the cud_log_format structure embedded in the cud item.
+ * It is at this point that we assert that all of the extent
+ * slots in the cud item have been filled.
+ */
+STATIC void
+xfs_cud_item_format(
+ struct xfs_log_item *lip,
+ struct xfs_log_vec *lv)
+{
+ struct xfs_cud_log_item *cudp = CUD_ITEM(lip);
+ struct xfs_log_iovec *vecp = NULL;
+
+ cudp->cud_format.cud_type = XFS_LI_CUD;
+ cudp->cud_format.cud_size = 1;
+
+ xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_CUD_FORMAT, &cudp->cud_format,
+ sizeof(struct xfs_cud_log_format));
+}
+
+/*
+ * Pinning has no meaning for an cud item, so just return.
+ */
+STATIC void
+xfs_cud_item_pin(
+ struct xfs_log_item *lip)
+{
+}
+
+/*
+ * Since pinning has no meaning for an cud item, unpinning does
+ * not either.
+ */
+STATIC void
+xfs_cud_item_unpin(
+ struct xfs_log_item *lip,
+ int remove)
+{
+}
+
+/*
+ * There isn't much you can do to push on an cud item. It is simply stuck
+ * waiting for the log to be flushed to disk.
+ */
+STATIC uint
+xfs_cud_item_push(
+ struct xfs_log_item *lip,
+ struct list_head *buffer_list)
+{
+ return XFS_ITEM_PINNED;
+}
+
+/*
+ * The CUD is either committed or aborted if the transaction is cancelled. If
+ * the transaction is cancelled, drop our reference to the CUI and free the
+ * CUD.
+ */
+STATIC void
+xfs_cud_item_unlock(
+ struct xfs_log_item *lip)
+{
+ struct xfs_cud_log_item *cudp = CUD_ITEM(lip);
+
+ if (lip->li_flags & XFS_LI_ABORTED) {
+ xfs_cui_release(cudp->cud_cuip);
+ kmem_zone_free(xfs_cud_zone, cudp);
+ }
+}
+
+/*
+ * When the cud item is committed to disk, all we need to do is delete our
+ * reference to our partner cui item and then free ourselves. Since we're
+ * freeing ourselves we must return -1 to keep the transaction code from
+ * further referencing this item.
+ */
+STATIC xfs_lsn_t
+xfs_cud_item_committed(
+ struct xfs_log_item *lip,
+ xfs_lsn_t lsn)
+{
+ struct xfs_cud_log_item *cudp = CUD_ITEM(lip);
+
+ /*
+ * Drop the CUI reference regardless of whether the CUD has been
+ * aborted. Once the CUD transaction is constructed, it is the sole
+ * responsibility of the CUD to release the CUI (even if the CUI is
+ * aborted due to log I/O error).
+ */
+ xfs_cui_release(cudp->cud_cuip);
+ kmem_zone_free(xfs_cud_zone, cudp);
+
+ return (xfs_lsn_t)-1;
+}
+
+/*
+ * The CUD dependency tracking op doesn't do squat. It can't because
+ * it doesn't know where the free extent is coming from. The dependency
+ * tracking has to be handled by the "enclosing" metadata object. For
+ * example, for inodes, the inode is locked throughout the extent freeing
+ * so the dependency should be recorded there.
+ */
+STATIC void
+xfs_cud_item_committing(
+ struct xfs_log_item *lip,
+ xfs_lsn_t lsn)
+{
+}
+
+/*
+ * This is the ops vector shared by all cud log items.
+ */
+static const struct xfs_item_ops xfs_cud_item_ops = {
+ .iop_size = xfs_cud_item_size,
+ .iop_format = xfs_cud_item_format,
+ .iop_pin = xfs_cud_item_pin,
+ .iop_unpin = xfs_cud_item_unpin,
+ .iop_unlock = xfs_cud_item_unlock,
+ .iop_committed = xfs_cud_item_committed,
+ .iop_push = xfs_cud_item_push,
+ .iop_committing = xfs_cud_item_committing,
+};
+
+/*
+ * Allocate and initialize an cud item with the given number of extents.
+ */
+struct xfs_cud_log_item *
+xfs_cud_init(
+ struct xfs_mount *mp,
+ struct xfs_cui_log_item *cuip)
+
+{
+ struct xfs_cud_log_item *cudp;
+
+ cudp = kmem_zone_zalloc(xfs_cud_zone, KM_SLEEP);
+ xfs_log_item_init(mp, &cudp->cud_item, XFS_LI_CUD, &xfs_cud_item_ops);
+ cudp->cud_cuip = cuip;
+ cudp->cud_format.cud_cui_id = cuip->cui_format.cui_id;
+
+ return cudp;
+}
--- /dev/null
+/*
+ * Copyright (C) 2016 Oracle. All Rights Reserved.
+ *
+ * Author: Darrick J. Wong <darrick.wong@oracle.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+#ifndef __XFS_REFCOUNT_ITEM_H__
+#define __XFS_REFCOUNT_ITEM_H__
+
+/*
+ * There are (currently) two pairs of refcount btree redo item types:
+ * increase and decrease. The log items for these are CUI (refcount
+ * update intent) and CUD (refcount update done). The redo item type
+ * is encoded in the flags field of each xfs_map_extent.
+ *
+ * *I items should be recorded in the *first* of a series of rolled
+ * transactions, and the *D items should be recorded in the same
+ * transaction that records the associated refcountbt updates.
+ *
+ * Should the system crash after the commit of the first transaction
+ * but before the commit of the final transaction in a series, log
+ * recovery will use the redo information recorded by the intent items
+ * to replay the refcountbt metadata updates.
+ */
+
+/* kernel only CUI/CUD definitions */
+
+struct xfs_mount;
+struct kmem_zone;
+
+/*
+ * Max number of extents in fast allocation path.
+ */
+#define XFS_CUI_MAX_FAST_EXTENTS 16
+
+/*
+ * Define CUI flag bits. Manipulated by set/clear/test_bit operators.
+ */
+#define XFS_CUI_RECOVERED 1
+
+/*
+ * This is the "refcount update intent" log item. It is used to log
+ * the fact that some reverse mappings need to change. It is used in
+ * conjunction with the "refcount update done" log item described
+ * below.
+ *
+ * These log items follow the same rules as struct xfs_efi_log_item;
+ * see the comments about that structure (in xfs_extfree_item.h) for
+ * more details.
+ */
+struct xfs_cui_log_item {
+ struct xfs_log_item cui_item;
+ atomic_t cui_refcount;
+ atomic_t cui_next_extent;
+ unsigned long cui_flags; /* misc flags */
+ struct xfs_cui_log_format cui_format;
+};
+
+static inline size_t
+xfs_cui_log_item_sizeof(
+ unsigned int nr)
+{
+ return offsetof(struct xfs_cui_log_item, cui_format) +
+ xfs_cui_log_format_sizeof(nr);
+}
+
+/*
+ * This is the "refcount update done" log item. It is used to log the
+ * fact that some refcountbt updates mentioned in an earlier cui item
+ * have been performed.
+ */
+struct xfs_cud_log_item {
+ struct xfs_log_item cud_item;
+ struct xfs_cui_log_item *cud_cuip;
+ struct xfs_cud_log_format cud_format;
+};
+
+extern struct kmem_zone *xfs_cui_zone;
+extern struct kmem_zone *xfs_cud_zone;
+
+struct xfs_cui_log_item *xfs_cui_init(struct xfs_mount *, uint);
+struct xfs_cud_log_item *xfs_cud_init(struct xfs_mount *,
+ struct xfs_cui_log_item *);
+void xfs_cui_item_free(struct xfs_cui_log_item *);
+void xfs_cui_release(struct xfs_cui_log_item *);
+
+#endif /* __XFS_REFCOUNT_ITEM_H__ */
projects / platform / kernel / linux-rpi.git / commitdiff